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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 94,715 | $ 54,040
12 Months or less, Unrealized Loss | (1,375) | (336)
More than 12 months, Fair Value | 37,532 | 36,125
More than 12 months, Unrealized Loss | (1,096) | (718)
Total Fair Value | 132,247 | 90,165
Total Unrealized Loss | (2,471) | (1,054)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 17,342 | 20,449
12 Months or less, Unrealized Loss | (158) | (100)
More than 12 months, Fair Value | 9,438 | 6,617
More than 12 months, Unrealized Loss | (123) | (92)
Total Fair Value | 26,780 | 27,066
Total Unrealized Loss | (281) | (192)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 27,137 | 4,057
12 Months or less, Unrealized Loss | (410) | (41)
More than 12 months, Fair Value | 7,168 | 7,309
More than 12 months, Unrealized Loss | (251) | (131)
Total Fair Value | 34,305 | 11,366
Total Unrealized Loss | (661) | (172)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 50,236 | 29,534
12 Months or less, Unrealized Loss | (807) | (195)
More than 12 months, Fair Value | 20,926 | 22,199
More than 12 months, Unrealized Loss | (722) | (495)
Total Fair Value | 71,162 | 51,733
Total Unrealized Loss | $ (1,529) | $ (690)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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